Hovering above the debris-strewn Guadalupe River, drone pilot Jordy Marks scans the flood-ravaged landscape with a quiet determination. As part of a civilian search and rescue team, Marks is helping guide ground crews to areas still untouched nearly a week after deadly floodwaters swept through Central Texas.

At least 119 people have been found dead in nearly a week since heavy rainfall overwhelmed the river and flowed through homes and youth camps in the early morning hours of July 4. Ninety-five of those killed were in the hardest-hit county in central Texas,